While that's true they can buy offensive items, they stop being a tank at that point and become fighters. There isn't necessarily anything wrong with that strategically, I just find it distasteful that Riot seems to be removing tanks from the game but if they're going to put a halt to that, I think adding 2 new jungle items would help a lot for it.
Where else would you put tanks but in the jungle, after all? You can make an argument for making them the bottom lane partner of the carry, but I feel like a support will generally always be the superior choice there. Tanks have been mostly crowded out from top lane for a while...and now it's gotten to the point with the various updates like the Sejuani update that Tanks just cannot compete in the jungle anymore either.
5 champs that can build either AD or AP jungle item? That's easy.
Nasus, Shyvana, Renekton, Shaco, Teemo.
The problem with the health jungle item is that it just is too vulnerable to health shredding items and abilities and there are a lot of those. Why, even the new Warwick punishes anyone that buys the health item because it's easier for him to get his W passive going against them than against someone that heals themselves. Elise has always been around and has a nasty habit of crushing tank jungle champions. Then there's Giant Slayer, Liandry's Torment and Blade of the Ruined King...items that require the tank to then get armor, magic resist, and lots of it, just so their health remains relevant. Why not just let them build magic resist or armor to start with?
Ever since they removed the smite buffs and replaced them with the plants(meaning Cinderhulk doesn't get value anymore from the Gromp buff since it no longer exists) I've been wishing they'd come out with alternative tank jungle items. This isn't a new thought from me. I just feel like we're in more desperate need of these kinds of items than ever, now that the state of tanks is in the worst place it's ever been.
Zac and SInged have been turned into supports, and Rammus is now some kind of weird diver/assassin hybrid. Our tanks are practically non-existent. We got Malphite and Cho'Gath...Poppy, maybe 1 or 2 more, and that's about it.